Bumblbeed cannot launch X server due to SUID X wrapper

The same problem as reported upstream in https://github.com/Bumblebee-Project/Bumblebee/issues/704 - secondary Xorg fails to start because it is being executed SUID by Xorg.wrap. Disabling executable bits on /usr/lib/xorg/Xorg.wrap makes it work.

Patch in https://github.com/Bumblebee-Project/Bumblebee/pull/743 allows setting Xorg binary path in bumblebee.conf working around this issue.

As a side note - as shipped bumblebee contains references to nvidia-current, but it appears at least some of nvidia packages do not set this alias. I suppose when I started with Ubuntu using 14.04, nvidia-340 was current; I never changed this version since then. Now it is no more current so I had to edit bumblebee.conf to explicitly point to nvidia-340.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: bumblebee 3.2.1-10
ProcVersionSignature: Ubuntu 4.8.0-51.54~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-51-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Wed May 17 07:17:34 2017
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-20140620-0
InstallationDate: Installed on 2015-07-02 (684 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20140620-04:25
SourcePackage: bumblebee
UpgradeStatus: Upgraded to xenial on 2016-10-29 (199 days ago)
mtime.conffile..etc.bumblebee.bumblebee.conf: 2017-05-17T07:06:00.523418
mtime.conffile..etc.bumblebee.xorg.conf.nouveau: 2016-10-29T14:38:07.748432
mtime.conffile..etc.bumblebee.xorg.conf.nvidia: 2016-10-29T14:41:41.888434